CN211694880U - Two-stage internal circulation gas burner device - Google Patents

Abstract

The utility model discloses a two-stage internal circulation gas burner device, including the combustion portion that has the air kuppe, the air compression section of thick bamboo, a plurality of outer lane rifle gas pipes, the dryer is got at the center, the swirler, the inner circle rifle, a plurality of outer lane rifle, the larynx, larynx one end is continuous with the outer wall of air compression section of thick bamboo through first connecting piece, the air kuppe is the awl tube-shape, the one end that the opening is little communicates with the air compression section of thick bamboo, the one end of outer lane rifle gas pipe passes the air kuppe and is linked together with the outer lane rifle in the larynx, a plurality of outer lane guns evenly set up along the circumference, the head of outer lane rifle is located the exit end of larynx, the center is got the dryer and is set up in the center of larynx, the axis of center is got the dryer and the axis collineatness of larynx, the one end of center is got the dryer and is linked to each other end of air compression section of, the axis of the inner ring gun is collinear with the axis of the throat, and two ends of the inner ring gun are respectively positioned at two sides of the swirler.

Description

Two-stage internal circulation gas burner device

Technical Field

The utility model belongs to the environmental protection field, concretely relates to second grade inner loop gas burner device.

Background

The ultra-low nitrogen combustor in the market adopts a flue gas external circulation mode to reduce nitrogen oxides, and a small part of combustors which utilize the flue gas internal circulation to reduce the nitrogen oxides also exist. The smoke external circulation combustor has the advantages of space arrangement limitation, high cost requirement, relatively low efficiency and high failure rate due to the fact that excessive smoke condensate water causes electrical elements to be easily damaged.

The flue gas internal circulation combustor in the market has high requirement on the space of a boiler combustion chamber, cannot achieve the preset target for low-nitrogen modification of old boilers, and most flame stabilizing devices can bring potential safety hazards and other problems by utilizing a central premixing technology, and cannot achieve the 30 mg of ultra-low nitrogen emission whole process.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a second grade inner loop gas burner device, this second grade inner loop gas burner device structural style utilizes the inside self-loopa technique of flue gas to make the gas burning in pressure-fired or negative pressure furnace in the flue gas external circulation technique relatively, its structural style can show improvement flue gas inner loop rate, reduce the combustion-supporting amount of wind, reduce air-blower power, the boiler exhaust gas temperature that more can effectively avoid the flue gas extrinsic cycle to bring reduces, the efficiency descends, the comdenstion water increases, electrical components fragile, the unstable problem of machine, and then reduce use cost.

In addition, be different from the steady flame mode of current flue gas inner loop on the market, the utility model provides a second grade inner loop gas burner device uses ripe total diffusion burning steady flame mode and gas layering segmentation technique to reduce nitrogen oxide, circulates through inside flue gas simultaneously and reaches the purpose that further reduces nitrogen oxide.

The utility model provides a second grade inner loop gas burner device has such characteristic, include: the combustion part comprises an air guide sleeve, an air compression cylinder, a plurality of outer ring gun gas pipes, a central air taking cylinder, a swirler, an inner ring gun, a plurality of outer ring guns and a throat opening, the throat opening is in a cylindrical shape with two open ends, one end is connected with the outer wall of the air compression cylinder through a first connecting piece, the other end is a free end, the air guide sleeve is in a conical cylinder shape, one end with a small opening is communicated with the air compression cylinder and is positioned at one end of the throat opening and used for enabling smoke in the combustion chamber of the boiler to flow back into the throat opening from the included angle between the throat opening and the air guide sleeve, one end of each outer ring gun gas pipe is connected with an air ring piece, the other end penetrates through the air guide sleeve to be communicated with the outer ring gun in the throat opening, the outer ring gun is provided with a tubular barrel, the axis of the barrel is parallel to the axis of the throat opening, the outer ring guns are uniformly arranged along the circumference, the central air taking barrel is arranged at the center of the throat opening, the axis of the central air taking barrel is collinear with the axis of the throat opening, one end of the central air taking barrel is connected with the inner wall of the air compression barrel through a third connecting piece, the swirler is arranged at the other end of the central air taking barrel, the inner ring gun is arranged in the swirler, the axis of the inner ring gun is collinear with the axis of the throat opening, two ends of the inner ring gun are respectively positioned at two sides of the swirler, and a plurality of inner ring jet holes are uniformly formed in the inner ring gun along the circumference.

The utility model provides an among the second grade inner loop gas burner device, a serial communication port, still include the air inlet, one end communicates with the combustion portion, wherein, the other end of air inlet is provided with the air-blast device, be used for supplying air to the air inlet, the air inlet includes the casing, the gas ring spare, the intake pipe, the casing is the tube-shape, both ends opening, the gas ring spare is the tube-shape, the setting is in the casing, the axis of gas ring spare and the axis collineation of casing, the section of gas ring spare is the ring, the one end and the gas ring spare intercommunication of intake pipe, the other end communicates with outside air supply, the axis of intake pipe is perpendicular with the axis of casing.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: wherein the ratio of the cross-sectional area of the air compression cylinder to the cross-sectional area of the central air taking cylinder is 10: 1-2: 1.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: wherein the overlapping range of the air compression cylinder and the throat opening is-20-50 mm.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: wherein the range of the outer ring gun gas pipe extending into the outer ring gun is-20-200 mm.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: wherein the ratio of the cross-sectional area of the outer ring gun gas pipe to the cross-sectional area of the outer ring gun is 1: 1.5-1: 8.

Additionally, be in the utility model provides an among the second grade inner loop gas burner device, its characterized in that still includes central rifle, the axis of central rifle and the axis collineation of larynx mouth, one end is located the inner circle rifle, and the other end passes gas ring spare and outside air supply intercommunication, and the tip of larynx mouth is stretched out to the head of outer lane rifle, and the head of inner circle rifle is located the larynx mouth, and the head of central rifle is located the inner circle rifle.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: wherein, the included angle between the center of the inner ring jet hole and the center of the outer ring gun is 10-90 degrees.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: wherein the inclination angle of the air guide sleeve is 12-60 degrees.

In addition, in the utility model provides a two-stage internal circulation gas burner device, can also have such characteristic: the swirler comprises an outer ring, an inner ring and a plurality of blades, the thickness of the outer ring is larger than that of the inner ring, the blades are in a right trapezoid shape, the width of the top edge is the same as that of the inner ring, the width of the bottom edge is the same as that of the outer ring, and the included angle between the plane of each blade and the axis of the inner ring is 7-70 degrees.

Action and effect of the utility model

According to the utility model discloses a second grade inner loop gas burner device because the position differs around the gas air gun is placed, forms layering, segmentation, has solved the problem that the gas was concentrated. The phenomenon that the local temperature is overhigh due to the concentration of fuel gas is avoided, so that the thermal nitrogen oxide is generated due to the reaction.

In addition, the outer ring gun fully utilizes the gas, the air and the flue gas to be mixed and then combusted, and aims to better mix the natural gas with the air, enable the flue gas to participate in preheating to enable the combustion to be more stable, avoid the gas residue caused by insufficient mixing, enable the natural gas to be fully combusted without waste, improve the efficiency of a combustor, enable the gas to be combusted without fierce, and further reduce the instantaneous and thermal nitrogen oxides.

Furthermore, the central air taking barrel adopts an independent air supply system and does not interfere with external smoke. Compared with the external gas flow, the central gas flow is relatively less, the independent air supply system enables the internal fluid and the external fluid not to interfere with each other, the central structure mode of the independent air supply is unchanged aiming at the condition that the boiler furnace structure is different, and the combustion can be always stable.

Furthermore, the central gun has relatively less gas, the purpose is to prevent oxygen atoms and nitrogen atoms in the air from reacting under the catalysis of the central fire at a higher temperature, the central flame exists to stabilize the whole flame, flameout and shutdown or even danger when the load of the burner is changed due to the formation of a central cavity is prevented, and the problems of central flame stabilization and overhigh central temperature are well solved.

The utility model discloses a second grade inner loop gas burner device structural style utilizes the inside self-loopa technique of flue gas to make the gas burning in pressure-fired or negative pressure furnace in the outside circulation technique of flue gas relatively, and its structural style can show improvement flue gas inner loop rate, reduces the combustion-supporting amount of wind, reduces air-blower power, and the boiler exhaust gas temperature that more can effectively avoid the flue gas extrinsic cycle to bring reduces, efficiency descends, the comdenstion water increases, electrical components fragile, the unstable problem of machine, and then reduces use cost.

In addition, be different from the steady flame mode of current flue gas inner loop on the market, the utility model provides a second grade inner loop gas burner device uses ripe total diffusion burning steady flame mode and gas layering segmentation technique to reduce nitrogen oxide, circulates through inside flue gas simultaneously and reaches the purpose that further reduces nitrogen oxide.

Drawings

FIG. 1 is a schematic cross-sectional view of a two-stage internal circulation gas burner apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic side view of a two-stage internal circulation gas burner apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the gas operation in the novel internal circulation low-nitrogen gas burner according to the embodiment of the present invention;

FIG. 4 is a schematic front view of a swirler in an embodiment of the present invention;

fig. 5 is a schematic front view of a single piece swirler in an embodiment of the invention;

FIG. 6 is a schematic top view of FIG. 5;

FIG. 7 is a side schematic view of FIG. 5;

FIG. 8 is a schematic cross-sectional view of an inner ring gun.

Detailed Description

In order to make the technical means, creation characteristics, achievement purpose and efficacy of the utility model easy to understand, the following embodiments are combined with the accompanying drawings to specifically describe the two-stage internal circulation gas burner device of the utility model.

Examples

As shown in fig. 1 and 2, the two-stage internal circulation gas burner apparatus is disposed in a boiler room, and includes an air inlet portion 10 and a combustion portion 20, for heating a boiler.

As shown in fig. 3, the boiler is located in the combustion area on the left side of the figure, and the two-stage internal circulation gas burner apparatus is located on the right side.

One end of the air intake part 10 is communicated with one end of the combustion part 20, and the other end of the air intake part 10 is provided with a blowing device for blowing air to the air intake part 10.

The air inlet portion 10 includes a housing 11, an air ring member 12, and an air inlet pipe 13.

The housing 11 is in a straight tubular shape and has openings at both ends.

The gas ring member 12 is cylindrical, a cylinder is arranged in the gas ring member 12, the cylinder and the cylinder wall of the gas ring member 12 form an annular gas passage 121, the gas ring member 12 is arranged in the shell 11, the axis of the gas ring member 12 is collinear with the axis of the shell 11, and the section of the gas ring member 12 is a circular ring.

One end of the air inlet pipe 13 is communicated with the air ring member 12, the other end is communicated with an external air source, the axis of the air inlet pipe 13 is perpendicular to the axis of the shell 11, and in the embodiment, the air inlet pipe 13 is communicated with the annular air passage 121 of the air ring member 12.

The combustion section 20 includes an air guide sleeve 21, an air compression cylinder 22, a plurality of outer lance gas pipes 23, a center lance 24, a center blow-off cylinder 25, a swirler 26, an inner lance 27, a plurality of outer lance 28, and a throat 29.

The air compression cylinder 22 is in a straight cylinder shape, and both ends thereof are open.

The air guide sleeve 21 is in a cone cylinder shape, one end with a large opening is communicated with one end of the shell 11, and the other end with a small opening is communicated with the air compression cylinder 22.

As shown in fig. 3, the two-stage internal circulation gas burner apparatus of the present embodiment guides the wind (air) from the air guide casing 21 into the outer ring lance 28 and the central wind-taking barrel 25 in the throat 29. On the outer side of the small-opening end of the air guide cover 21, the air compression utilizes the Bernoulli principle to generate local low pressure in the combustor, so that the smoke inside the boiler combustion chamber is forced to flow back into the throat 29 from the included angle between the throat 29 and the air guide cover 21.

The angle g of the inclined plane of the air guide sleeve 21 ranges from 12 degrees to 60 degrees.

The range of the angle g of the inclined plane of the air guide cover 21 is set to be 12-60 degrees, experimental research proves that the air compression effect is obvious in the 12-60 degree section, the resistance of the combustor is increased when the angle is larger than 60 degrees, the efficiency of the combustor is reduced, the air compression effect is not obvious when the angle is smaller than 12 degrees, and the internal circulation of the flue gas can not be carried out by utilizing the Bernoulli principle. In the embodiment, the bevel angle g is 30 °.

The throat 29 is a cylinder with two open ends, one end is connected with the outer wall of the air compression cylinder 22 through a connecting piece 291, and the other end is a free end. In the embodiment, the overlapping range d of the air compression cylinder 22 and the throat 29 is-20-50 mm, which is actually the adjustment of the smoke recycling amount, when the volume of a hearth chamber of the boiler is too large, the excessive smoke recycling can cause the instability of outer ring flame, and possibly bring about the phenomenon of fire-off (fire-off: the phenomenon that the flow rate of fresh combustible mixed gas exceeds the flame propagation speed, so that the flame front cannot be settled and propagates along the incoming flow direction). In the embodiment, the overlapping range d is 20 mm.

One end of the outer ring gun gas pipe 23 is connected with the annular gas passage 121 of the gas ring 12, and the other end passes through the air guide sleeve 21 and is communicated with the outer ring gun 28 in the throat 29.

The outer ring lance 28 has a tubular barrel whose axis is parallel to the axis of the throat 29, a plurality of outer ring lances 28 are arranged uniformly along the circumference, and a plurality of outer ring lance gas pipes 23 are arranged correspondingly to the plurality of outer ring lances 28.

The head of the outer ring gun 28 is positioned at the outlet end of the throat 29, and the inner wall of the tail of the outer ring gun 28 is connected with the outer wall of the outer ring gun gas pipe 23 through at least one connecting piece. Wherein, one end of the outer ring gun gas pipe 23 extends into the outer ring gun pipe.

The overlapping range e of the outer ring gas gun pipe 23 and the outer ring gun is-20-200 mm. The overlapping range e is set to be-20-200 mm in order to deal with the hearth pressure of the boiler, and when the boiler meets a micro-positive pressure boiler (the micro-positive pressure boiler refers to a boiler in which the pressure of smoke in a combustion chamber and a flue of the boiler in operation is 200-400 Pa higher than the atmospheric pressure). The flue gas has the flue gas recovery volume because there is the inside oil pressure of boiler furnace this moment comparatively ideal, therefore but size e coincidence scope is wider, even coincide to 200 millimeters, also can reach the mixed state of outer lane rifle flue gas. If a negative pressure combustion boiler (the negative pressure combustion boiler refers to a boiler in which the flue gas pressure in a hearth and a flue of the boiler in operation is lower than the atmospheric pressure) is met, more guide force is needed, so that the size e needs to be controlled to be about-20 mm to achieve a better effect (under the same working condition, the sectional area of the pipeline is fixed, and the resistance of the pipeline is larger as the pipeline is longer), and in the embodiment, the size e of the overlapping range is 50 mm.

The ratio of the diameters j to h of the outer ring gas gun pipe 23 and the outer ring gun 28 flue gas mixing pipe is set to be 1: 1.5-1: 8. The method aims to increase the flow guiding force if a negative pressure combustion boiler (the negative pressure combustion boiler refers to a boiler with the smoke pressure in a hearth and a flue of the boiler in operation lower than the atmospheric pressure) is met, so that the size j needs to be controlled, the area of the size h needs to be enlarged, and the smoke recovery effect is improved, otherwise, the area of the size h is enlarged. In the examples, the ratio of the diameter j to h is 1: 1.7.

In an embodiment, as shown in FIG. 2, the number of outer ring guns 28 is 6.

The outer lance 28 fully utilizes the mixing of the fuel gas, the air and the flue gas and then burns, as shown in fig. 3, the flue gas and the air (air) returning to the combustor in the 281 combustion chamber at the tail part of the outer lance 28 enter the outer lance 28 and are mixed with the natural gas entering from the outer lance gas pipe 23 in the outer lance 28 to form mixed gas which is output.

The central air taking barrel 25 is arranged in the center of the throat 29, the axis of the central air taking barrel 25 is collinear with the axis of the throat 29, one end of the central air taking barrel 25 is connected with the inner wall of the air compression barrel 22 through at least one connecting piece 251, and the cyclone 26 is arranged at the port of the other end of the central air taking barrel 26.

Ratio b of cross-sectional areas of the air compression cylinder 22 and the central air intake cylinder 25: the range of c is 10: 1-2: 1, the purpose of the range is to adapt to different working conditions, when the burner is burnt in different hearths of different boilers (hearths: three-dimensional space for fuel burning surrounded by furnace walls, the hearths are used for ensuring that the fuel is burnt out as much as possible, and the temperature of flue gas at the outlet of the hearths is cooled to the temperature allowed by safe work of a convection heating surface, therefore, the hearths have enough volume and can be provided with enough heating surfaces. In the examples, the ratio of the cross-sectional areas b: c ranges from 5: 1.

The cyclone 26 is arranged in the central air taking barrel 25 and is positioned at the port of the central air taking barrel 25 and used for generating cyclone air.

As shown in fig. 4, the swirler 26 includes an outer ring 261, an inner ring 262, and a plurality of vanes 263.

The thickness of the outer race 261 is greater than the thickness of the inner race 262, one side of the inner race 262 is flush with the side 2611 of the outer race 261, and the other side of the inner race 262 is within the outer race 261.

As shown in fig. 5, 6 and 7, the blade 263 has a right trapezoid shape, the width of the top side is the same as the thickness of the inner ring 262, the width of the bottom side is the same as the thickness of the outer ring 261, and the included angle between the plane of the blade 263 and the axis of the inner ring 262 is b.

The number of the blades 263 is 5 to 10, and the angle b is 7 to 70 °. In the embodiment, the side 2611 of the outer ring 261 faces the outlet end of the throat 29, the number of blades 263 is 6, and the angle b is 60 °.

The inner ring guns 27 are arranged in the cyclone 26, the axes of the inner ring guns 27 are collinear with the axis of the throat 29, and two ends of the inner ring guns 27 are respectively positioned at two sides of the cyclone 26.

As shown in fig. 8, the inner ring gun 27 is annular, an annular air passage 271 is arranged in the annular wall, a plurality of inner ring injection holes 272 shown in fig. 8 are uniformly arranged on the inner ring gun 27 along the circumference, the included angle between the axis of the inner ring injection hole 272 and the axis of the inner ring gun 27 is 0-90 °, the inner ring injection holes 272 are located at one end of the inner ring gun 27 and communicate the outside with the annular air passage 271, and in the embodiment, the number of the inner ring injection holes 272 is 6-12. The other end of the inner ring gun 27 is further provided with a through hole for communicating the outside with the annular air passage 221, one end of a gas delivery pipe (not shown) is communicated with the through hole, and the other end of the gas delivery pipe is communicated with a natural gas source to deliver natural gas to the inner ring gun 27.

In the embodiment, the number of the inner ring injection holes 272 is 6, and the inner ring injection holes 272 correspond to the middle of the blades 263.

The central lance 24 is tubular and has a lance head with an axis collinear with the axis of the throat 29, the central lance 24 head being located at one end within the inner ring lance 27 and at the other end communicating with an external gas source through the gas ring member 12.

In the illustrated embodiment, the center lance 24 has a smaller cross-sectional area than the outer ring lance 28, resulting in less core flow and lower core temperature for the center lance 24. The central gun 24 adopts independent air supply, the central air taking barrel 25 is a single path of air supply without mixing of flue gas, and is provided with a swirler 26 with a swirling device, as shown in fig. 3, swirling air generated by the swirler 26 is mixed with natural gas sprayed by the inner ring gun 27 to form mixed gas, internal flue gas circulation does not participate in inner layer combustion, and flame stabilization is facilitated.

In the embodiment, the outer ring gun 28, the inner ring gun 27 and the central gun 24 are arranged in a layered manner.

As shown in fig. 2, the gun head is divided into 3 layers radially according to the size of a reference circle, and the gun head is divided into an outer gun 28, an inner gun 27 and a center gun 24 from outside to inside, wherein a is the reference circle of the outer gun 28, B is the reference circle of the inner injection hole 272, and C is the reference circle of the head of the center gun 24. Wherein, the angle a between the connecting line of the axis of the inner ring gun 27 and the center of the inner ring injection hole 272 and the connecting line of the axis of the inner ring gun 27 and the center of the outer ring gun 28 is 45-65 degrees.

The head of the outer ring gun 28 extends out of the end of the throat 29, the head of the inner ring gun 27 is positioned in the throat 29, the head of the central gun 24 is positioned in the inner ring gun 27, as shown in fig. 1, the outer ring gun 28, the inner ring gun 27 and the central gun 24 are respectively arranged from left to right, and the front-back axial direction is also divided into 3 sections.

This part is actually the purpose of burner fuel stratification, with 2 benefits: 1. the fuel layering enables the fuel distribution of all parts of the hearth to be basically consistent, the distribution is more uniform, the temperatures of all parts of the hearth are basically consistent, and the generation of high-temperature peak points and the generation of nitrogen oxides are avoided. 2. The fuel can be better and more fully mixed with the wind through the layering, the carbon monoxide emission standard exceeding caused by uneven mixing is reduced, and the efficiency of the combustor is reduced.

Effects and effects of the embodiments

According to the second grade inner loop gas burner device of this embodiment, because the front and back position that the gas air gun placed differs, form layering, segmentation, solved the problem that the gas was concentrated. The phenomenon that the local temperature is overhigh due to the concentration of fuel gas is avoided, so that the thermal nitrogen oxide is generated due to the reaction.

The second grade inner loop gas burner device of this embodiment is direct in the boiler combustion chamber forced circulation with the flue gas, and its aim at preheats the air that natural gas and air-blower come in, makes the burning more stable. The recycled flue gas has relatively lower content of oxygen atoms and nitrogen atoms compared with air, so that the emission of nitrogen oxides is reduced. Compare outside gas circulation and can lead to flue gas cooling to reduce the combustor thermal efficiency, inside gas circulation is bad than outside gas circulation, and the reaction is in the boiler combustion chamber, is favorable to the combustor thermal efficiency more.

In addition, the outer lane rifle burns after make full use of gas mixes with wind and flue gas, and its aim at better messenger is natural mixes with the air, lets the flue gas participate in preheating and makes the burning more steady, avoids mixing the gas that the abundant leads to and remains, can let the natural gas abundant burning not extravagant, improves combustor efficiency, can let the gas burning again not violent, further reduces instantaneous nitrogen oxide.

Furthermore, the central air taking barrel adopts an independent air supply system and does not interfere with external smoke. Compared with the external gas flow, the central gas flow is relatively less, the independent air supply system enables the internal fluid and the external fluid not to interfere with each other, the central structure mode of the independent air supply is unchanged aiming at the condition that the boiler furnace structure is different, and the combustion can be always stable.

Furthermore, the central gun has relatively less gas, the purpose is to prevent oxygen atoms and nitrogen atoms in the air from reacting under the catalysis of the central fire at a higher temperature, the central flame exists to stabilize the whole flame, flameout and shutdown or even danger when the load of the burner is changed due to the formation of a central cavity is prevented, and the problems of central flame stabilization and overhigh central temperature are well solved.

The second grade inner loop gas burner device structural style of this embodiment utilizes inside self-loopa technique of flue gas to make the gas burning in pressure-fired or negative pressure furnace in the outside circulation technique of flue gas relatively, and its structural style can show improvement flue gas inner loop rate, reduces the combustion-supporting amount of wind, reduces air-blower power, more can effectively avoid the boiler exhaust gas temperature reduction that the outer loop of flue gas brought, efficiency decline, the comdenstion water increases, electrical components is fragile, the unstable problem of machine, and then reduce use cost.

In addition, different from the flame stabilizing mode of the existing flue gas internal circulation on the market, the two-stage internal circulation gas burner device provided by the embodiment reduces nitrogen oxides by using a mature full-diffusion combustion flame stabilizing mode and a fuel gas layering segmentation technology, and simultaneously achieves the purpose of further reducing nitrogen oxides by circulating through internal flue gas.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims (10)

1. The utility model provides a second grade inner loop gas burner device, installs on the boiler for heat the boiler, its characterized in that includes:

the combustion part comprises an air guide sleeve, an air compression barrel, a plurality of outer ring gun gas pipes, a central air taking barrel, a swirler, an inner ring gun, a plurality of outer ring guns and a throat,

the throat opening is in a cylindrical shape with two open ends, one end of the throat opening is connected with the outer wall of the air compression cylinder through a first connecting piece, the other end of the throat opening is a free end,

the air guide cover is in a cone cylinder shape, one end with a small opening is communicated with the air compression cylinder and is positioned at one end of the throat opening, and the air guide cover is used for returning the smoke in the boiler combustion chamber to the throat opening from the included angle of the throat opening and the air guide cover,

one end of the outer ring gun gas pipe penetrates through the air guide sleeve and is communicated with the outer ring gun in the throat opening,

the outer ring gun is provided with a tubular barrel, the axis of the tubular barrel is parallel to the axis of the throat,

the outer ring guns are uniformly arranged along the circumference, the head parts of the outer ring guns are positioned at the outlet end of the throat opening, the tail parts of the outer ring guns are connected with the outer wall of the outer ring gun gas pipe through second connecting pieces,

the central air taking barrel is arranged in the center of the throat opening, the axis of the central air taking barrel is collinear with the axis of the throat opening, one end of the central air taking barrel is connected with the inner wall of the air compression barrel through a third connecting piece, the swirler is arranged at the other end of the central air taking barrel,

the inner ring guns are arranged in the cyclone, the axes of the inner ring guns are collinear with the axis of the throat, two ends of each inner ring gun are respectively positioned on two sides of the cyclone, and a plurality of inner ring jet holes are uniformly formed in the inner ring guns along the circumference.

2. The two-stage internal circulation gas burner apparatus of claim 1, further comprising:

an air intake part, one end of which is communicated with the combustion part,

wherein the other end of the air inlet part is provided with a blast device for blowing air to the air inlet part,

the air inlet part comprises a shell, an air ring piece and an air inlet pipe,

the shell is cylindrical, two ends of the shell are open,

the gas ring piece is cylindrical and arranged in the shell, the axis of the gas ring piece is collinear with the axis of the shell, the section of the gas ring piece is a circular ring,

one end of the air inlet pipe is communicated with the air ring piece, the other end of the air inlet pipe is communicated with an external air source, and the axis of the air inlet pipe is perpendicular to the axis of the shell.

3. The two-stage internal circulation gas burner apparatus as recited in claim 2, further comprising:

the axis of the central gun is collinear with the axis of the throat, one end of the central gun is positioned in the inner ring gun, the other end of the central gun penetrates through the gas ring piece to be communicated with an external gas source,

the head of the outer ring gun extends out of the end part of the throat, the head of the inner ring gun is positioned in the throat, and the head of the central gun is positioned in the inner ring gun.

4. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

wherein the ratio of the cross-sectional areas of the air compression cylinder and the central air taking cylinder is 10: 1-2: 1.

5. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

wherein the overlapping range of the air compression cylinder and the throat opening is-20-50 mm.

6. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

the range of the outer ring gun gas pipe extending into the outer ring gun is-20-200 mm.

7. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

wherein the ratio of the cross-sectional area of the outer ring gun gas pipe to the cross-sectional area of the outer ring gun is 1: 1.5-1: 8.

8. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

wherein the included angle between the center of the inner ring jet hole and the center of the outer ring gun is 10-90 degrees.

9. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

wherein the inclination angle of the air guide sleeve is 12-60 degrees.

10. The two-stage internal circulation gas burner apparatus according to claim 1, wherein:

wherein the swirler comprises an outer ring, an inner ring and a plurality of vanes,

the thickness of the outer ring is larger than that of the inner ring,

the blades are in a right trapezoid shape, the width of the top edge is the same as the thickness of the inner ring, the width of the bottom edge is the same as the thickness of the outer ring,

the included angle between the plane of the blade and the axis of the inner ring is 7-70 degrees.

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